Update docusaurus.config.js

Author: HsiangNianian

docusaurus.config.js

@@ -21,7 +21,11 @@ const config = {
   // If you aren't using GitHub pages, you don't need these.
   organizationName: 'retrofor', // Usually your GitHub org/user name.
   projectName: 'retro', // Usually your repo name.
-
+  
+  
+  // plugins
+  themes: ['@docusaurus/theme-live-codeblock'],
+  
   // Even if you don't use internalization, you can use this field to set useful
   // metadata like html lang. For example, if your site is Chinese, you may want
   // to replace "en" with "zh-Hans".